Abstract
Background
Cementless glass ceramics containing apatite and wollastonite (AW-GC) bottom-coated
titanium hip implants were developed; early excellent clinical and radiographic results
have been reported previously. This study aimed to investigate the long-term clinical
and radiographic outcomes in detail, and the wear rate of HXLPE.
Methods
We retrospectively evaluated 99 patients (117 hips) between November 2001 and December
2007. The survival rate was estimated using the Kaplan–Meier method. Hip joint function
was evaluated using the Japanese Orthopaedic Association (JOA) score. The extent of
radiographic signs was determined from the radiographs performed at the last follow-up.
Polyethylene wear was measured using Martell's Hip Analysis Suite. We assessed the
possible factors affecting the steady-state linear wear rate.
Results
The mean follow-up period was 14.8 ± 2.1 (10–18.6) years. The mean JOA score improved
to 88.7 ± 9.4 (59–100) at the final follow-up from 47.8 ± 12.5 (17–76) before surgery.
The overall survival rate with the end point of all-cause revision and wear-related
revision was 99% and 100% respectively. There was no osteolysis or loosening of either
the acetabular or femoral component. All hips were classified as having bone ingrowth
fixation. The mean steady-state wear rate was 0.008 ± 0.025 mm/year. We found no significant
correlation between the wear rate and age, body weight, body mass index, cup inclination
and femoral head size.
Conclusion
The combination of AW-GC bottom-coated implants and HXLPE showed excellent implant
survival and wear resistance for 15 years.
Keywords
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Article info
Publication history
Published online: January 17, 2022
Accepted:
December 22,
2021
Received in revised form:
November 30,
2021
Received:
August 17,
2021
Identification
Copyright
© 2022 The Japanese Orthopaedic Association. Published by Elsevier B.V. All rights reserved.
